Active modulation of laser coded systems using near infrared video projection system based on digital micromirror device (DMD)
Active modulation of laser coded systems using near infrared video projection system based on digital micromirror device (DMD)
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DOI：
10.1117/12.2214300
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发表时间：
2016-03
期刊：
影响因子：
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通讯作者：
Aly Khalifa;H. A. Aly;A. F. El-Sherif
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文献类型：
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作者：
Aly Khalifa;H. A. Aly;A. F. El-Sherif
近红外（NIR）动态场景投影系统用于执行在NIR频带中操作的被测单元的硬件在环（HWIL）测试。一类这些单元的共同和复杂的要求是一个动态的场景，是时空变化。本文应用并研究了近红外激光器在不同时间频率范围内的主动外调制。我们使用的数字摄像机设备（DMD）集成的近红外投影系统的核心，以产生这些动态场景。我们部署的空间图案的DMD控制器，同时产生所需的幅度，通过脉冲宽度调制（PWM）的反射镜元件以及时空图案。采用基于DMD的不同光学掩模组合，实现了高稳定、高功率可见光（640 nm红光）和近红外（976 nm半导体激光）的调制和编码。这些空间通用的主动编码策略，为低和高频率的kHz范围内的不同目标的辐照度，由我们的系统产生，并记录使用VIS-NIR快速相机。利用快速响应光电探测器阵列测量了时间调制的激光脉冲轨迹。最后，使用高分辨率光谱仪，我们评估了近红外动态场景投影系统的响应，在保持投影后的近红外光源的波长和频带扩展。
Near infrared (NIR) dynamic scene projection systems are used to perform hardware in-the-loop (HWIL) testing of a unit under test operating in the NIR band. The common and complex requirement of a class of these units is a dynamic scene that is spatio-temporal variant. In this paper we apply and investigate active external modulation of NIR laser in different ranges of temporal frequencies. We use digital micromirror devices (DMDs) integrated as the core of a NIR projection system to generate these dynamic scenes. We deploy the spatial pattern to the DMD controller to simultaneously yield the required amplitude by pulse width modulation (PWM) of the mirror elements as well as the spatio-temporal pattern. Desired modulation and coding of high stable, high power visible (Red laser at 640 nm) and NIR (Diode laser at 976 nm) using the combination of different optical masks based on DMD were achieved. These spatial versatile active coding strategies for both low and high frequencies in the range of kHz for irradiance of different targets were generated by our system and recorded using VIS-NIR fast cameras. The temporally-modulated laser pulse traces were measured using array of fast response photodetectors. Finally using a high resolution spectrometer, we evaluated the NIR dynamic scene projection system response in terms of preserving the wavelength and band spread of the NIR source after projection.